This is Hotel Recognition Sensor Card Insert to Gain Power Switch QD02CY . When the guests leave the room and remove the door card (be sure to pull cards because the guests have to use this card to come back to open the door), this switch cut off power automatically after 10 seconds. It has many advantages, for example, bring direct economic benefits to the hotel, extend the electrical life of rooms, enhance the electricity safety factor of rooms and conform global inchgreen energy inch called.